After eating some inadequately cooked, raw or pickled crustaceans, the new host will swallow some nice metacercariae - an intermediate stage between egg and larvae - and will start to hatch in the duodenum. The larvae then will start penetrating the wall of your gut and rest a bit in your peritoneal cavity. After having a wee lie down, it starts the journey of finding its way through your diaphragm into your lungs. There they build themselves a nice little cave communicating with the bronchial tree (probably for the fresh air and the good view) and start hatching. Being hermaphrodites they don't need anybody else to reproduce, and soon you, the host will star coughing up the eggs and releasing them into the open again.